Re: C68 & detecting vsync
Posted: Sun Feb 13, 2022 8:55 am
The value is increased on every V-Sync, so the wait should be the same (except a little bit later as the OS handlers will first execute normally)
With the poll/wait routine in, I observe that each time I call it, the delay gets shorter and shorter relative to the same wait value I pass it, an initial value of 10 - which is a noticeable delay at first, ultimately becomes almost imperceptible after being called more than 5 or 6 times.
Also, the poll/wait routine appears to be causing a memory leak - my free memory pool available to malloc from decreases by (approximately) 512 bytes after each call as I suspect there is a new job being created on each call.
Should there be a call to remove the poll/wait routine, or somehow reinstantiate the existing job?
The implementation is a very basic one:
Code: Select all
void screen_Vsync(unsigned char wait){
volatile unsigned int c = 0;
poll_init(&c);
while (c < wait){
}
}
Code: Select all
draw_Box(screen, x1, y1, w, h, 0, PIXEL_WHITE, PIXEL_WHITE, MODE_PIXEL_SET);
draw_String(screen, col, y, max_chars, 1, 0, screen->font_8x8, PIXEL_BLACK, c, MODE_PIXEL_XOR);
screen_Vsync(10);
for (i = 0; i < 4; i++){
// Invert text and highlight
draw_Box(screen, x1, y1, w, h, 0, PIXEL_BLACK, PIXEL_BLACK, MODE_PIXEL_SET);
draw_String(screen, col, y, max_chars, 1, 0, screen->font_8x8, fill, c, MODE_PIXEL_SET);
screen_Vsync(5);
// Normal text
draw_Box(screen, x1, y1, w, h, 0, PIXEL_WHITE, PIXEL_WHITE, MODE_PIXEL_SET);
draw_String(screen, col, y, max_chars, 1, 0, screen->font_8x8, PIXEL_BLACK, c, MODE_PIXEL_XOR);
screen_Vsync(5);
}
